Or you can try vade’s de-interlace shader v001.deinterlace.jxs (attached to this post – seems to be gone from the internet these days?)

I think both shaders do simple field mixing, so they look better than "singlefield 1", but you won’t get full sharpness either. You can read about smarter de-interlacing methods on the VLC wiki (none are available in MAX though).